Method for optimizing an optical surface

A method for determining at least one optical surface of an optical lens, the method comprising:

• providing at least one parameter that defines the at least one optical surface to be determined, and an initial value of said at least one parameter defining an initial optical surface;
• defining a working optical surface to be equal to at least a portion of the initial optical surface;
• providing a first surface cost function, the first surface cost function being a function of the nth derivative of the working optical surface defined by the at least one parameter with n being an integer greater than or equal to 2;
• providing a set of surface cost functions, each surface cost function of the set of surface cost functions being a function of at least one criterion over an evaluation zone of the working optical surface defined by the at least one parameter and the set of surface cost functions comprising at least one cost function;
• evaluating a global surface cost function, the global surface cost function being a weighted sum of the first surface cost function and each surface cost function of the set of surface cost functions;
• modifying the working optical surface;
• and
• determining a value of the at least one optical surface parameter that minimizes the global surface cost function by repeating the evaluating of the global surface cost function and the modifying of the working optical surface so as to minimize the global surface cost function.